Bar-after-cut quick release



Jan. 17, 1928.

w. D. JOHNSON BAR AFTER our QUICK RELEASE Filed March 21. 1927 Jan. 17, 1928.

W. D. JOHNSON BAR AFTER cur QUICK REL-EASE Filed March 21. 1927 2 Sheets-Sheet 2 Patented Jan. 17, 1928.

UNITED STATES'PATENT OFFICE.

WALLACE n. aonnson, "or BIELOIT. WISCONSIN, nssrenon ro Yarns-Anastasia MA oHInE COMPANY, OF 1213mm, WISCONSIN, A CORPORATION OF DELAWARE.

BAR-AFTER-CUT QUICK RELEASE.

Application filed March 21, 1927..

The present invention relates to wood working machines, and has to do particularly with the way in which the barsaftercut associated with the top heads in such machines are withdrawn from and ad justed as to working position.

The principal object of the invention is to provide an improved release by means of which a bar-after-cut may be quickly withdrawn from working position.

Another important object is to provide an improved adjuster by means of which a bar-after-cut equipped with the previously mentioned release may be adjusted as to working position, and, when once adjusted, will be returned accurately to, such position after operation of the release.

While the foregoing statements are indicative in a general way of the nature of the invention, other objects and advantages will be evident to those skilled in the art upona full understanding of the construction, mounting and adjustment of the bar-aftercut.

One embodiment of the invention is presented herein for the purpose of exemplitication, but it will of course be appreciated that the invention is susceptible of embodiment in other structurally different forms coming equally within the scope of the appended claims. i

In the accompanying drawings:

Fig. l is an end view of'a top head yoke, showing in association therewith a bar-aftercut equipped withthe quick release and adjustment features of the invention;

Fig. 2 is a rear view of one end ofthe yoke and bar; and

Fig. 3 is atransverse section through the yoke and bar, taken on the line 3 Fig. 2. l D

The barafter-cut 10 is positioned benea v the upper portion 11 of a cutter head yoke 152, and is provided at its ends with lugs 13 which extend into inclined grooves 142 in' the side portions 15 of the yoke,whereby to permit the bar to be shifted toward or away from the upper portion of the yokealong an inclined plane. so

a of the bar by means of a number of screws 17, and the front edge of the plate isbeveled ofi in order to fit closely up to the cutting circle 19 ofthe associated cutter head. The 55 rear edge 20 of the plate is beveled off like the yoke.

A face plate 16 is secured to the bottom Serial No. 177,025.

the front edge in order to permit the plate to be reversed in position upon becoming worn. Inasmuch as the screws 17 are nearer one edge of the plate than the other extra threaded apertures 21 are provided in the plate to receive the screws when the plate is reversed.

The bar 10 backs up against a shaft 22 which extends through the upper portion of the yoke from one side portion of the same to the other. The shaft is eccentrically journaled at its ends in apertures 23 formed are positioned in the grooves let between the lugs 13 and two blocks 28 in the lower ends of the'groove. The pressure with which the bar is held against the shaft may be increased or diminished by moving theblocks farther into or out of the grooves. In order to permit the blocks to be moved conveniently, the bottoms 29 of the same are formed atan angle to the sides of the grooves and screws 30 are extended through the slots 81' 111 the tapering corners of the blocks into the blocks will be cammed upwardly in the grooves by the heads of the screws, and, when the screws are turned in the opposite direction, the blocks will move downwardly under the action of the springs 27.

The working position ofthe bar 10 relative to the cutting plane of'the cutter head" may be varied by turning the eccentric shaft slightly in one direction or the other, such turning movement being effectedby a worm 82 which is in mesh witha pinion 33 secured to one end of the eccentric shaft. The worm is secured to the lower end of a shaft 3%, and a control handleZ-h") is secured to the upper end of the shaft for t-urningthe same; v

The pinion, worm and shaft are encased within a housing 36 which is pivoted to the yoke about an axis concentric witlrthat of the eccentric'shaft. As a result, when the. handle is gripped and the housing is swung aboutits pivotal axis, the worm locks the pinion to the housing and the eccentricshaft is turned through a corresponding arc, caus- When the screws areturned up,

ing the eccentric face of the shaft in contact with the bar to be retracted. The bar will of course follow such eccentric face under the action of the springs 27 and will be withdrawn from working position. lVhen the housing'isswung in the opposite direction again, the bar will be returned to precisely the same working position as that to which it had previously been adjusted by the worm. The handle 35 is prevented from being turned inadvertently while it is being swung, by means ofa small spring 87 which is attached to the housing and bears frictionally against a serrated surface on the handle, and the housing 36 which forms the support for the handle, is locked in working position by means of a spring-pressed pin 38 which is carried bythe casing and is provided with a finger knob 39. The pin extends into an aperture d0 in one end of an arcuate arm 41 secured to the yoke,ai1d, when the pin is withdrawn from the aperture and the handle is swung downwardly, the end ofthe pin will slide freely along the smooth surface of the arm. A stop lug 42 is provided on the arm a substantial dis tance from theaperture 40 for limiting the extent to which the handle and Housing may be swung. p p

The front edge of the upper portion 11 of the yoke is sharply beveled to provide a snug sliding fit with the opposed face of the bar 10, and such fit effectively prevents chips fromentering and wedging between the yoke and the bar. t

From the foregoing description, it will be appreciated that a bar-after-cut embodying the features of this invention may be accurately adjusted asto working position by turning a single control handle in one direction or the other, and may be released temporarily from such working position by swingingthe same handle, without disturbingthe adjustment of the working position.

I claim: i i 1. In a Wood-working machine, a cutter head, a bar-after-cut, and means movable in one direction to adjust the working position of the bar and movable in another direction to release the bar from such position without destroying the adjustment.

2,111 a wood-working machine, a cutter head, a bar-afte'r-cut, an eccentric for holdin the bar in working position, means for turning the eccentric to release the bar from such position, and means for lockingjthe eccentric with the bar in working position.

In a woodworking machine, a cutter head, a bar-after-cut, an eccentric for holding the bar in working position, means for turning the eccentric to adjust such position, and means for yieldingly resisting turning movement ofthe eccentric, whereby to prevent the bar, from moving inadvertently.

4. In a wood-working machine, a cutter head, a bar-after-cut, and a rotatable and pivoted control handle which when turned will adjust the working position of the bar and when swung will release the bar from such position without destroying the adjust ment. I

In a woodworking machine, a top head yoke, top head journalcd in the yoke, upwardly and rearwardly inclined guides in the yoke behind the top head, a bar-aftcr-cut supported in the guides, an eccentric for holding the bar in working position, and means for turning the eccentric to move the bar in the guides.

6. In awood=working machine, a top head yoke, a top head journaled in the yoke, a

bar-after-cut supported by the yoke, an cc centric for holding the bar in working position, means, for turning the eccentric slowly to adjust the working position of the bar, and means for turning the eccentric rapidly to release the bar from working position. j

T. In a wood-working machine, a cutter head, a bar-after-cut, an eccentric shaft for holding the bar in working position, a pinion on the shaft, a worm in mesh with the pinion, and a handle for turning the worm to rotate the pinion.

8. In a wood-working machine, a cutter head, a bar-after-cut, an eccentric shaft for holding the bar in working position, a pinion on the shaft, a bracket pivoted conccntrically with the pinion, a worm journalcd in the bracket in mesh with the pinion, and means for either rotating or swinging the worm whereby to turn the eccentric shaft either slowly or rapidly.

9. In a wood-working machine, a cutter head, a bar--after-cut, an eccentric shaft for holding the bar in working position, a pinion on the shaft, a bracket pivoted concentrically with the pinion, a worm journaled in the bracket in mesh with the pinion, means for either rotating or swinging the worm whereby to turn the eccentric shaft either slowly or rapidly, and means for preventing the worm from rotating 'iuadvcrb ently.

10. In a wood-marking machine, a cuties head, a bar-after-cut, an eccentric shaft for holding the bar in working position, a pin ion on the shaft, a bracket pivoted concentrically with the pinion, a worm journaled in the bracket in mesh with the pinion, means for either rotating or swinging the worm whereby to turn the eccentric shaft,

either slowly or rapidly, means for preventing the worm from rotating inadvertently, and means for preventing it-from swinging inadvertently. i I

11. In a wood-working machine, a cutter head, a harsher-cut, an eccentric for hold ing the bar in working position, resiliently yieldable means pressing the bar against the eccentric, and means for turning the IUU eccentric to vary the working position of the bar.

12. In a Wood-working machine, a cutter head, a bar-after-cut, a face plate on the bottom of the bar having both front and rear edges shaped for association with the cutter head, and means for permitting the plate to be reversed in position 011 the bar to bring the rear edge of the plate into the position formerly occupied by the front edge whereby to permit use of the rear edge upon the front edge becoming worn.

13. In a wood-Working machine, a top head yoke, a top head journaled in the yoke, upwardly and rearwardly inclined guides in the yoke behind the top head, a bar-after out supported in the guides, means for holding the bar in the guides in working position, and means for moving the bar lengthwise of the guides to or from working position.

In testimony whereof I have hereunto subscribed my name.

WALLACE n. JOHNSON. 

